Sheet glass grinding and polishing apparatus



Dec. 15, 1931. I J. DRAKE ETAL 1,835,354

SHEET GLASS GRINDING AND POLISHING APPARATUS Filed Sept. 29, 19 6 s Sheets-Sheet 1 Q/ohr) LL Drake Frank F aser:

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Dec. 15, 1 931. L D AKE ET AL 1,836,364

SHEET GLASS GRINDING AND POLISHING APPARATUS Filed Sept. 29, 1926 3 Sheets-Sheet 2 I Z0 9 I O I \i w/ /2 i l O O I E 1 r: 4- M. I o J /7 dob/'7 L. Drake Frank Fraser Dec. 15, 1931. (J, DRAKE ET AL 1,836,364

SHEET GLASS GRINDING AND POLISHING APPARATUS Filed Sept. 29, 1926 3 Sheets-Sheet 3 gnvwnfoz ojohr) L Drake. Frank Fraaen Patented Dec. 15,' 1931 UNITED STATES PATEN T eer e]:

JOHN L. DRAKE Am) FRANK rnasnn, or 'ronnno, 01110, ASSIGNORS 'ro nrnnn'r ownns roan GLASS COMPANY, or 'ronnno, OHIO, A conronarron or new SHEET GLASS. GRINDING AND PQLISHIIQ'G APPARATUS Application file d September 29, 1926. Serial No. 138,515.

The present invention relates to sheet glass apparatus wherein a sheet of glass is continuously and progressively moved in contact with a series of rotatable cylindrical abrasion rolls, the texture of the abrasion toward the other, the last set of rolls being adapted to polish the sheet of glass. 7 Still another object of the invention isto provide an apparatus of this nature wherein a sheet of glass is adapted to be ground by means of an abrasive in cake form, the same sheet then being adapted to be polished by means of a polishing medium in solid form. Other objects and advantages of the invention will become more apparent during the course or" the following description.-

In the drawings wherein like numerals are employed to designate like parts throughout the same,

Fig. l is a diagrammatic view illustrating my improved grinding and polishing apparatus,

Fig. 2 is a similar view illustrating a continuation of Fig. 1, Fig. 3 is a transverse section showing suitgble driving means for said abrasion memers,

Fig. 4 is a top plan View of the arrange-. ment shown in Fig. 3. z

Fig. 5 is a transverse section through aportion of the apparatus showing the mounting for the feed rolls.

ig. 6 is a longitudinal section another form of the invention, Figs. 7, 8 and 9 show different forms of abrasion rolls, and

Fig. 10 is a fragmentary sectional view il lustrating one means of supporting a glass blank during the ,grinding and polishing 59 operations.

illustrating I 15 rolls being progressively finer from one end 'I-Ieretpfore, it has been customary to produce plate glass by subjecting a glass blank to the action of grinding and polishing units. The grinding units ordinarily include a metallic surfaclng member which is moved'in contact with the sheet to grind the same when coupled in its action with the action of an abrasive suspended in water. The polishing of the ground blank has been accomplished in the past by moving a. plurality of felt blocks over the ground surface, the felt blocks being aided in their polishing action by means of rouge or the like.

In the present invention a sheet of glas is first ground by means of an abrasive in cake form, after which the ground sheet is polished by means of a polishing medium in cake form.

SUED In the drawings the numeral 10 designates j a plurality of abrasion rolls which are shown in Fig. 1 as belng arranged in pairs. The abrasion rolls A to B are grinding rolls,while the rolls C to D inclusive are polishing rolls. Feed members or rolls 9 may be used to cause a continuous and progressive movement of the glass blanks 12 between the rolls as illustrated. Conduits 13 may be used to dis charge a spray of water or the like 14 upon the rolls and sheet to prevent overheating of either. The texture of the rolls from A to B inclusive becomes progressively finer so that the sheet, after contacting with the roll B, will have a'final smooth thereon, which means "that the surfaces of the sheet are in a condition to be polished. The texture of the rolls C to D also may vary, if desired. These,

' rolls are formed from a material such-as pumice or rouge in cake form, the rouge and pumice bein held in suitable formation by means of a inder. The speed of the sheet and number of rolls is such that the sheet,

upon leaving the last roll of the sheet of rolls D, will be polished and ready forcommercial use.

In Fig. 3 is illustrated a method of supsprocket chain or the like 16. As-motor 17.

'95 porting and driving the abrasion rolls 10.

is used to drive the shafts 11 and rolls 10. Trucks 18 may be employed, being supported upon the wheels 19 resting on the rails 20.

' a The feed rolls 9 are positioned between adjacent pairs of abrasion rolls and are adapted to feed the sheet therebetween and incontact therewith. As shown in Fig. 5, the feed rolls 9 may be journaled at their opposite ends in standards or the like 27 and 28 and are preferably geared together by means of gears 29 driven in any suitable manner such as by means of a sprocket and chain connection 30. Either one or both of the feed rolls of each pair is adapted to be provided at its opposite ends with flanges or collars 31 which serve to keep the plate of glass from moving sideways upon reciprocation of the abrasion rolls.

In Fig. 6 is shown a construction wherein one side only of a sheet of glass is surfaced at a time. The sheets of glass in this instance may be supported on tables 23 carried by the wheels 24 riding on the tracks 25. The tables may be coupled together to form a continuous unit, after which they are moved continuously and progressively beneath the abrasion rolls 26 Which are mounted in a manner similar to the sets of rolls illustrated in Fig. 3.

The abrasion rolls or sets of rolls from A to B inclusive may be formed from emery, carborundum, or some similar material. The polishing rolls may likewise be formed from any material having the proper texture.

It is to be understood that the form of the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Claims:

1. In apparatus for surfacing sheet glass, a plurality of pairs of abrasive rolls arranged in two lines for receiving the glass sheets to be surfaced therebetween, feed rolls positioned between adjacent pairs of abrasive .rolls, means for driving the feed rolls to feed the glass between the abrasive 'rolls, means forv driving the abrasive rolls,

means for reciprocating said abrasive rolls transversely of the line of feed of the glass,

venting transverse movement of the glass upon reciprocation of the abrasive rolls.

2. In apparatus for surfacing sheet glass, a plurality of pairs of abrasive rolls arranged in two lines for receiving the glass sheets to be surfaced therebetween, trucks arranged at opposite ends of the rolls, rails upon which said trucks are movably mounted, frames connecting opposed trucks and adapted to support the abrasive rolls, means carried by the frames for driving said rolls, and means connected with said trucks for moving the same to reciprocate the rolls transversely over the glass, feed rolls positioned between adjacent pairs of abrasive rolls, means for driving the feed rolls to feed the glass between the abrasive rolls, and means carried at the ends of the feed rolls for preventing transverse movement of the glass upon reciprocation of the abrasive rolls.

3. In apparatus for surfacing sheet glass, a plurality of pairs of abrasive rolls arranged in two substantially horizontal lines, means 'for feeding the glass sheet between the two linesof rolls and in contact therewith, means for supporting each pair of rolls, said means including trucks arranged at opposite ends thereof, rails upon which said trucks are mounted, means for moving said trucks upon said rails to reciprocate the abrasive rolls transversely of the line of movement of said sheet, and means for preventing transverse ber,1926.

JOHN L. DRAKE. FRANK FRASER. 

